What is torch-on roofing?

Why torch-on works so well in Auckland

Auckland combines high rainfall, salt-laden air and strong UV, all of which are tough on roofing materials. Torch-on membranes create a continuous waterproof layer with minimal weak points, dramatically reducing the risk of leaks compared with more joint-heavy systems. Modern torch-on membranes are formulated to resist UV, temperature swings and weathering, so they can stand up to coastal exposure and changing seasons when correctly detailed.

New Zealand’s building guidance recognises torch-on as a robust option for roofs, decks and balconies when installed to recognised codes of practice and BRANZ-appraised systems. For Auckland homeowners, that means a system that not only performs in local weather but also aligns with compliance expectations when designed and installed properly.

Key benefits of torch-on roofing

Torch-on roofing offers a mix of performance and practicality that makes it a go-to solution for many architects, builders and body corporates. Some of the main advantages include:

• Exceptional waterproofing performance on flat and low-slope roofs, reducing leak risk even where water can pond.

• High durability and puncture resistance, making it suitable for roofs that may see moderate foot traffic for maintenance or as roof decks (with appropriate protection layers).

• Flexibility to handle building movement and complex roof shapes, including upstands, parapets and tricky transitions.

• Strong UV and weather resistance, which is critical in New Zealand’s high-UV climate.

• Long service life when installed and maintained correctly, providing a cost-effective whole-of-life solution.

Because the membrane can be finished in different colours and surface textures, it can also form an aesthetic, tidy-looking layer on modern flat-roofed homes and apartments.

Typical uses around your home or building

Torch-on membranes are highly versatile and can be used in a range of situations where long-lasting waterproofing is required. Common applications include:

• Flat and low-slope roofs on homes, units and commercial buildings.

• Roof decks and terraces that will be finished with tiles, timber decking or other trafficable surfaces over the top.

• Balconies and podiums where water tends to sit and find weak spots in less robust systems.

• Roofs with complex detailing, multiple angles or penetrations such as skylights, vents and parapets.

Because torch-on can be integrated as part of a warm or cold roof build-up, it also works well in systems where insulation and vapour control need to be carefully designed to manage condensation.

How A Plus Waterproofing approaches torch-on work

At A Plus Waterproofing, torch-on membrane work is treated as a specialist trade, not an add-on. We focus on proven torch-on systems for roofs, decks and balconies, chosen for their performance in New Zealand conditions and their alignment with local building compliance requirements.

Our typical process includes thorough substrate preparation, correct falls, and careful detailing at edges, outlets and penetrations to eliminate common leak points. We then apply the membrane in accordance with the manufacturer’s technical literature and relevant codes of practice, using trained installers and appropriate safety controls around the torch work. For occupied homes, we work closely with owners and builders to stage the job around weather, access and other trades to minimise disruption.

If you are planning a new build or renovation with a flat roof, deck or balcony, we can work from the design stage to recommend the most suitable torch-on system and build-up so that waterproofing, drainage and finishes all work together from day one.

Basic care and maintenance for torch-on roofs

While torch-on systems are known for being low maintenance, a little care goes a long way in protecting your investment. Simple steps homeowners and building managers can take include:

• Keeping gutters, scuppers and outlets clear so water can drain freely and does not sit on the roof longer than necessary.

• Avoiding unnecessary foot traffic on exposed membrane, and using protection layers where the roof is used as a deck or regular access route.

• Trimming back overhanging trees that can drop leaves, branches and sap that contribute to blockage and surface damage.

• Scheduling periodic professional inspections to check laps, terminations, flashings and penetrations, especially after major weather events.

If any damage, bubbling or suspect areas are noticed, addressing them promptly helps prevent minor issues from turning into leaks. A Plus Waterproofing can inspect, maintain and repair existing torch-on roofs, even where we were not the original installer, and advise on whether localised repairs or a full re-roof is the most sensible option.

Is torch-on roofing right for your project?

Torch-on roofing is an excellent choice if you have a flat or low-slope roof, a roof deck or balcony, or a complex roof layout where reliable waterproofing is critical. It offers a durable, long-term solution that is well suited to Auckland’s wet, coastal, high-UV environment when installed and maintained correctly.

If you are unsure whether torch-on is the best fit, A Plus Waterproofing can review your plans or existing roof and recommend the most appropriate membrane system for your budget, design and performance needs.